Águas Livres Aqueduct

The Águas Livres Aqueduct (Aqueduto das Águas Livres) is one of Lisbon's best-known landmarks and is regarded as a remarkable example of 18th-century Portuguese engineering. Its stone arches over the Alcântara valley show how ambitious it was to supply a capital city with fresh water.

What is the Águas Livres Aqueduct?

It is not a single bridge but a whole system for collecting and carrying water. Gravity moved the water from springs about 15 kilometres northwest of Lisbon to fountains and water points in the city. The pipelines that survive total roughly 58 kilometres. Work spanned 1731 to 1799, with the main construction starting in 1748 under King John V. The project was designed by António Canevari, Manuel da Maia and Carlos Mardel.

Why are the arches over the Alcântara valley so famous?

The most dramatic stretch crosses the Alcântara valley on 35 arches. The largest is 65 metres high and 32 metres wide, and is described as the highest stone arch in the world. Carlos Mardel designed it. The structure came through the 1755 earthquake, which badly damaged many other parts of Lisbon.

Where does the water end up?

The system's terminal reservoir is Mãe d'Água, in the Amoreiras district. It was designed in 1745 and completed in 1834. Today it is one of the sites of the Museu da Água (Water Museum), run by EPAL.

Can you walk on the aqueduct?

Yes. The aqueduct was only fully taken out of service in 1973 and opened to the public in 1986. The visitor route runs between Campolide and the Monsanto Forest Park. Walking the gallery on top of the arches gives views over the Alcântara valley and the surrounding city. Check opening hours and access rules before you go, on the Water Museum website or at a Lisbon tourist office.

Frequently asked questions

When was the Águas Livres Aqueduct built? Work ran from 1731 to 1799, and the main construction began in 1748.

How tall is the largest arch? It is 65 metres high and 32 metres wide.

Did it survive the 1755 earthquake? Yes, the arches across the Alcântara valley withstood the quake that destroyed much else in Lisbon.

Since when can visitors go in? Since 1986, after the aqueduct was decommissioned in 1973.

Where does the water system end? At the Mãe d'Água reservoir in Amoreiras, now part of the Water Museum.

In short

Águas Livres combines scale, engineering and city history in one place. If you like technical heritage or Lisbon panoramas, it is worth adding to your itinerary, ideally together with the Water Museum and the Mãe d'Água reservoir.